Vortex-flow electromagnetic emission in stacked intrinsic Josephson junctions

TL;DR

This paper demonstrates the excitation of collective transverse plasma modes by Josephson vortex motion in stacked intrinsic Josephson junctions, revealing potential for microwave emission and oscillator development.

Contribution

It provides experimental confirmation of plasma modes and microwave emission in intrinsic Josephson junctions, advancing understanding of vortex dynamics and electromagnetic applications.

Findings

Observation of multiple subbranches in current-voltage characteristics.

Detection of microwave emission due to resonance phenomena.

Confirmation of collective plasma modes excited by vortex motion.

Abstract

We confirmed the existence of the collective transverse plasma modes excited by the motion of the Josephson vortex lattice in stacked intrinsic Josephson junctions of Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$ by observing the multiple subbranches in the Josephson-vortex-flow current-voltage characteristics. We also observed the symptom of the microwave emission from the resonance between the Josephson vortex lattice and the collective transverse plasma modes, which provides the possibility of developing Josephson-vortex-flow electromagnetic oscillators.